The present invention provides a method for saving by-pass capacitor by using circuit board, which includes (1) providing a liquid crystal panel including two glass substrates and liquid crystal material containing liquid crystal molecules, the glass substrates forming a liquid crystal panel driving circuit, which includes a gate driver, a source driver, gate lines, and data lines; (2) providing a power supply module and a power connection circuit board including a base material on which a power route and a grounding route are provided to respectively form exposed copper zones at a location where a by-pass capacitor is desired to form so as to form an equivalent by-pass capacitor; (3) connecting the gate driver and the source driver via the power connection circuit board to the power supply module; and (4) activating the power supply module to control rotation of the liquid crystal molecules of each of the pixel units.